<?php
namespace framework\ext;
//上传类
class UploadFile {
    public $maxSize = 10485760; // 上传文件的最大值，默认10M
    public $allowExts = array();    //允许的文件后缀
    
    public $savePath ='';   // 上传文件保存路径
    public $saveRule = 'md5_file'; //命名规则
    public $autoSave = true;    //自动保存，设置为false，自定义存储方式
    public $domain = 'public';
    
    public $thumb = false; //是否开启缩略图
    public $thumbMaxWidth = 100;    //缩略图最大宽度
    public $thumbMaxHeight = 100;   //缩略图最大高度   
    public $thumbPrefix = 'thumb_'; //缩略图前缀
    public $thumbPath = '';  //缩略图保存路径，为空则为上传文件保存路径savePath
    
    protected $saeStorage = NULL;
    protected $uploadFileInfo = array(); //上传成功的文件信息
    protected $errorMsg = ''; //错误信息
    
    public function __construct($savePath="public/uploads/", $allowExts = array('gif','jpg','jpeg','bmp','png'), $maxSize = 10485760) {
        $this->savePath = $savePath;
        $this->allowExts = $allowExts;
        $this->maxSize = $maxSize;
        if( class_exists('SaeStorage') ) {
            $this->saeStorage = new SaeStorage();
        }       
    }
    
    public function upload($key='') {
        if( empty($_FILES) ) {
            $this->errorMsg = '没有文件上传！';
            return false;
        }
        if( empty($key) ) {
            $files = $_FILES;
        } else {
            $files[$key] = $_FILES[$key];
        }
        
        $num = 0;       
        foreach($files as $key =>$file) {
            if( $file['error'] == 4 ) continue;
            $saveRuleFunc = $this->saveRule;
            $pathinfo = pathinfo($file['name']);
            
            $file['key'] = $key;
            $file['extension'] = strtolower( $pathinfo['extension'] );
            $file['savepath'] = $this->savePath;
            $file['savename'] = $saveRuleFunc( $file['tmp_name'] ) . '.' . $file['extension'];
            //检查文件类型大小和合法性
            if ( !$this->check($file) ) {
                return false;
            }
            //存储文件
            if ( $this->autoSave ) {
                if( isset($this->saeStorage) ) {
                    $file['savepath'] = str_replace(array('../', './'), '', $file['savepath']);
                    $ret = $this->saeSave($file['tmp_name'], $file['savepath'] . $file['savename']);
                } else {
                    $ret = $this->localSave($file['tmp_name'], $file['savepath'] . $file['savename']);
                } 
                if( !$ret ) {
                    return false;
                }           
                $this->thumb($file); //缩略图片
            }
            
            $this->uploadFileInfo[$key] = $file;
            $this->uploadFileInfo[$num++] = $file;
        }
        return true;
    }
    
    //检查文件类型大小和合法性
    protected function check($file) {
        //文件上传失败
        if($file['error'] !== 0) {
            $this->errorMsg= '文件上传失败！';
            return false;
        }   
        //检查文件类型
        $this->allowExts = array_map('strtolower', $this->allowExts);       
        if( !in_array($file['extension'], $this->allowExts) ) {
            $this->errorMsg = '上传文件类型不允许！';
            return false;
        }
        //检查文件大小
        if ( $file['size'] > $this->maxSize ) {
            $this->errorMsg = '上传文件大小超出限制！';
            return false;
        }
        //检查是否合法上传
        if(!is_uploaded_file($file['tmp_name'])) {
            $this->errorMsg = '非法上传文件！';
            return false;
        }
        // 如果是图像文件 检测文件格式
        if( in_array($file['extension'], array('gif','jpg','jpeg','bmp','png','swf')) && false === getimagesize($file['tmp_name']) ) {
            $this->errorMsg = '非法图像文件';
            return false;
        }
        //检查通过，返回true
        return true;
    }
        
    //缩略图片
    protected function thumb($file) {
        if ($this->thumb && in_array($file['extension'], array('gif', 'jpg', 'jpeg', 'bmp', 'png')) ) {
            $this->thumbPath = $this->thumbPath ? $this->thumbPath : $file['savepath'];
            $thumbname = $this->thumbPath . $this->thumbPrefix . basename($file['savename']);
            require_once(dirname(__FILE__).'/Image.class.php'); 
            $imagename =  isset($this->saeStorage) ? $file['tmp_name'] : $file['savepath'] . $file['savename'];
            return Image::thumb($imagename, $thumbname, $this->domain, $this->thumbMaxWidth, $this->thumbMaxHeight); // 生成图像缩略图
        }
        return false;
    }
        
    //sae存储
    protected function saeSave($srcFileName, $destFileName) {
        if ( false!= $this->saeStorage->upload($this->domain, $destFileName, $srcFileName) ) {
             return true;
        } else {
            $this->errorMsg = $this->saeStorage->errmsg();
            return false;
        }
    }

    //本地存储
    protected function localSave($srcFileName, $destFileName) {
        $dir = dirname($destFileName);
        if ( !is_dir($dir) ) {
            if ( !mkdir($dir, 0777, true) ) {
                $this->errorMsg = '上传目录' . $dir . '不存在';
                return false;
            }
        } else {
            if ( !is_writeable($dir) ) {
                $this->errorMsg = '上传目录' . $dir . '不可写';
                return false;
             }
        }
        if( move_uploaded_file($srcFileName, $destFileName) ) {
            return true;
        } 
        $this->errorMsg= '文件上传保存错误！';
        return false;
    }
    
    //上传成功获取返回信息
    public function getUploadFileInfo() {
        return $this->uploadFileInfo;
    }
    
    //获取错误信息
    public function getErrorMsg() {
        return $this->errorMsg;
    }
}
